The Commonwealth has a Core population on Earth, with a base Tax rate of 65% and a +10% Capitalist Bonus from a trait, their Industrial Index is the default 1, they have an Economic Health of 5

Earth has an MI from Planetary type and atmosphere of 5and the following mineral deposits

Level

MI

Rating

Heavy Metals

Normal

1

12

Radioactives

Abundant

1.5

17

Non-Metallics

Normal

1

10

Industrial Metals

Motherlode

2

28

for a total MI of 10.5 and a rating of 120+170+100+280=670MI * rating gives an exploitation index of 7035

So Income works out atExploitation Index * industrial Index (7035*1) of 7035

So, Nominal Income is 703565% of that for base tax is 457375% of that for population adjustment is 3430100% of that for EH level of 5 is 343010% of that for Capitalist is 343

For a monthly total of (3430+343) 3773

As this is actually pretty complex to work out, I'd suggest a similar example to this being included in the Income section of the rules. It would certainly have helped me figure it out without having to pester you